|
|
Digestive System
How the Digestive Process is Controlled
Hormone Regulators
A fascinating feature of the digestive system is that it contains its own regulators. The major hormones that control the functions of the digestive system are produced and released by cells in the mucosa of the stomach and small intestine. These hormones are released into the blood of the digestive tract, travel back to the heart and through the arteries, and return to the digestive system, where they stimulate digestive juices and cause organ movement.
The hormones that control digestion are Gastrin, Secretin, and Cholecystokinin (CCK):
- Gastrin causes the stomach to produce an acid for dissolving and digesting some foods. It is also necessary for the normal growth of the lining of the stomach, small intestine, and colon.
- Secretin causes the pancreas to send out a digestive juice that is rich in bicarbonate. It stimulates the stomach to produce pepsin, an enzyme that digests protein, and it also stimulates the liver to produce bile.
- Cholecystokinin (CCK) causes the pancreas to grow and to produce the enzymes of pancreatic juice, and it causes the gallbladder to empty.
Nerve Regulators
Two types of nerves help to control the action of the digestive system. Extrinsic (outside) nerves come to the digestive organs from the unconscious part of the brain or from the spinal cord. They release a chemical called acetylcholine and another called adrenaline. Acetylcholine causes the muscle of the digestive organs to squeeze with more force and increase the "push" of food and juice through the digestive tract. Acetylcholine also causes the stomach and pancreas to produce more digestive juice. Adrenaline relaxes the muscle of the stomach and intestine and decreases the flow of blood to these organs.
Even more important, though, are the intrinsic (inside) nerves, which make up a very dense network embedded in the walls of the esophagus, stomach, small intestine, and colon. The intrinsic nerves are triggered to act when the walls of the hollow organs are stretched by food. They release many different substances that speed up or delay the movement of food and the production of juices by the digestive organs.
Your Digestive System and How It Works
Movement of Food Through the System
Production of Digestive Juices
Carbohydrates
How the Digestive Process is Controlled
|
Nexium - Esomeprazole
Aciphex - Rabeprazole
Prevacid - Lansoprazole
Prilosec - Omeprazole
Prilosec OCT
Protonix - Pantoprazole
| GastroEsophageal Reflux Disease
|
GERD
Causes of GERD
Diet for GERD
Infant GERD
Children 1 - 11 Years Old
Medication for GERD
Symptoms of GERD
GERD Surgery
GERD Treatment
Heartburn
Causes of Heartburn
Symptoms of Heartburn
Heartburn Medications
Heartburn Remedy
Can Flatulence Be Controlled
Lump In Throat
Proton Pump Inhibitors
Remedies for GERD
Acne
Hair Removal
HGH
|